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That casting number is very common for a small block Chevy. The 235 number you describe is in the position of the casting date of the block.
All casting dates begin with a letter. H86 would be 08-08-1966, H is the eighth letter in the alphabet. Are you sure the first number is a 2. It would have to be an A to L for a month code.
Anything stamped on the front passenger side of the block where the water pump is attached?
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